code: def test_negative_nbins(self):
      value_range = [0.0, 5.0]
      values = []
      with self.assertRaisesRegex(
          (errors.InvalidArgumentError, ValueError), "must > 0"
      ):
          with self.session():
              bins = histogram_ops.histogram_fixed_width_bins(
                  values, value_range, nbins=-1
              )
              self.evaluate(bins)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import test_util
  from tensorflow.python.framework import constant_op
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import histogram_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 4 for calling the BinValuesFixedWidth obj's underlying member method code with example usage: obj.test_negative_nbins() without return types